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Патент USA US3053698

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United States Patent 0 ICC
er
3,053,685
,,
Patented Sept. 11, 1962
2
1
red or pink colour. The glaze may conveniently be of
the following composition:
3,053,685
PIGMENTS
Moles
Helen Dolores Jamieson, Woodlands, Malpas, Newport,
South Wales, assignor to Associated Lead Manufactur
ers Limited, London, England, a British company
Sodium and potassium oxides (together) _______ __
0.3
Calcium oxide
0.4
___
Barium oxide ______________________________ __
Boric oxide ________________________________ __
No Drawing. Filed Apr. 13, 1961, Ser. No. 102,650
Claims priority, application Great Britain Apr. 25, 1960
5 Claims. (Cl. 106—299)
0.3
0.6
Alumina __________________________________ __ 0.35
Silica
This invention provides 1a stain or pigment for in 10
____________________________________ __
3.5
What I claim as my invention and desire to secure by
corporation in glazes for ceramics. Such stains consist
ing of a mixture of tin oxide, whiting and potassium
Letters Patent is:
dichromate are known ‘and confer on the glaze a pink
colour. I have found that a stain which will impart an
which is constituted by a calcined mixture of the follow
1. A stain for incorporation in glazes 'for ceramics
equally satisfactory colour to the glaze can be produced 15 ing ingredients 10-20 parts by weight of zircon, 5-10
parts by weight of tin oxide, 3-10 parts by weight of
at a lower cost by substituting for part of the tin oxide
whiting and 0.5-10 parts by weight of potassium dichro
zircon, i.e. cleaned and ground zircon ore.
mate.
The stain according to the invention consists of a
calcined mixture of the ‘following ingredients, parts being
parts by weight:
20
Parts
2. A glaze ‘for ceramics which includes a stain as
claimed in claim 1.
3. A stain as claimed in claim 1 in which the ingredients
are 16.5 parts by weight of zircon, 5 parts by weight
of tin oxide, 6.75 parts by weight of whiting and
0.825 part by weight of potassium dichromate.
Whiting ________________________________ __
3-10
4. A stain as claimed in claim 1, in which the ingredi
Potassium dichromate _____________________ __ 0.5-1.0 25
ents are 10 parts by weight of zircon, 10 parts by weight
The invention includes a method of manufacturing such
of tin oxide, ‘6.3 parts by weight of Whiting and 0.77
a stain in which the ingredients are subjected to calcina
part by weight of potassium dichromate.
Zircon _________________________________ __
10-20
Tin oxide _______________________________ __
5-10
tion at a temperature between 1100° ‘C. and 1400° C.,
Washed with dilute mineral acid and then with water and
?nally calcined again at a temperature between 1100°
C. and 1400“ C.
In a typical case, the zircon, the tin oxide and the
whiting are mixed in powdered form, a 5% solution of
5. A method of manufacturing a stain for incorpora
tion in glazes for ceramics, which includes the steps of
calcining for one hour a mixture in powdered form of
10-20 parts by weight of zircon, 5-10 parts by weight
of tin oxide, 3-10 parts by weight of whiting and 0.5-10
parts by Weight of potassium dichromate at 1a temperature
between 1100° C. and 1400“ .C., the zircon being present
in the mixture as particles having a size not exceeding
5 microns, washing the calcined mixture ?rst with mineral
acid and then with water and ?nally calcining again for
potassium dichromate is added to the mixed powders and
the resulting paste is ‘dried on a water 1bath with constant
stirring.
The product is then sieved through a 100 mesh sieve
BS. and ‘calcined at between 1100° C. and 1350° C. for
one hour.
The calcine is then washed, once with 10% hydro 40
chloric acid and twice with water, followed by drying
a further hour at a temperature between 1100° C. and
1400° C.
References Cited in the ?le of this patent
at 120° C.
The mixture is recalcined at 1200° C. for one hour.
The following are examples of two typical stains ac
2,234,920
Stillwell ____________ __ Mar. 11, 1941
cording to the invention, the ingredients being given in 45
2,847,317
iCarnahan et al. ______ __ Aug. 12, 1958
parts by weight:
2,875,085
Morris et a1. ____- _____ __ Feb. 24, 1959
1,058,919
Germany ____________ __ June 4, 1959
1
Zircon of 5 microns top particulate size ______________ __
Tin oxide. _
Whiting
Potassium Dichromate ______________________________ __
16. 5
6. 0
UNITED STATES PATENTS
FOREIGN PATENTS
2
10
10
6. 75
6.3
0. 825
0. 77
50
OTHER REFERENCES
Serial No. 324,184, Diehl (A.P.C.), published July 13,
1943.
A mill addition of about 6% by weight of a stain ac
cording to the invention to a zinc tfree glaze yields a clear 55
Serial No. 368,408, Diehl (A.P.C.), published July 13,
1943.
i
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